TAILIEUCHUNG - báo cáo khoa học: "Prenatal and postnatal correlated responses in maternal traits of mice assessed by crossfostering"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Prenatal and postnatal correlated responses in maternal traits of mice assessed by crossfostering | Génét. Sél. Evol. 1986 18 2 145-156 Prenatal and postnatal correlated responses in maternal traits of mice assessed by crossfostering 1 2 . EISEN and . BANDY 2 Department of Animal Science North Carolina State University Box 7621 Raleigh NC 27695-7621 . Summary A crossfostering design was used to estimate correlated responses in prenatal genetic and postnatal maternal effects for maternal traits of mice female body weights at mating at parturition and at 12-d postpartum litter size and weight at birth percent born alive standardized 12 pups 12-d litter weight and birth to 12-d litter feed efficiency litter weight gain dam feed intake . Lines of mice had been selected as follows large first-parity litter size at birth L large 6-wk body weight W an index for large litter size and small 6-wk body weight L W and randomly K . Prenatal line refers to the line into which a female was born and postnatal line is that of the foster mother that nursed the female. Crossfostering sets were formed at birth with equal numbers of pups from the 4 lines reared either in litters of 8 or 16. Dams reared in litters of 8 were heavier had larger litters at birth and larger litter weights at birth and 12-d postpartum P . No biologically important interactions were found between number reared and prenatal genetic effects or between number reared and postnatal maternal effects. Selection for litter size at birth and or 6-wk body weight resulted in large correlated responses in maternal traits. Correlated responses in postnatal maternal effects were relatively small compared with prenatal genetic effects. Prenatal genetic by postnatal maternal interactions generally were not of biological importance. Postnatal maternal effects contributed much less to correlated responses in traits associated with reproduction and maternal performance compared with growth-related traits. Key words Correlated responses maternal effects reproductive traits mice. Resume Réponses corrélées pré- .

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